Babylon.js/dist/preview release/loaders/babylon.stlFileLoader.js

/// <reference path="../../../dist/preview release/babylon.d.ts"/>
var BABYLON;
(function (BABYLON) {
    var STLFileLoader = (function () {
        function STLFileLoader() {
            this.solidPattern = /solid (\S*)([\S\s]*)endsolid[ ]*(\S*)/g;
            this.facetsPattern = /facet([\s\S]*?)endfacet/g;
            this.normalPattern = /normal[\s]+([\-+]?[0-9]+\.?[0-9]*([eE][\-+]?[0-9]+)?)+[\s]+([\-+]?[0-9]*\.?[0-9]+([eE][\-+]?[0-9]+)?)+[\s]+([\-+]?[0-9]*\.?[0-9]+([eE][\-+]?[0-9]+)?)+/g;
            this.vertexPattern = /vertex[\s]+([\-+]?[0-9]+\.?[0-9]*([eE][\-+]?[0-9]+)?)+[\s]+([\-+]?[0-9]*\.?[0-9]+([eE][\-+]?[0-9]+)?)+[\s]+([\-+]?[0-9]*\.?[0-9]+([eE][\-+]?[0-9]+)?)+/g;
            // force data to come in as an ArrayBuffer
            // we'll convert to string if it looks like it's an ASCII .stl
            this.extensions = {
                ".stl": { isBinary: true },
            };
        }
        STLFileLoader.prototype.importMesh = function (meshesNames, scene, data, rootUrl, meshes, particleSystems, skeletons) {
            var matches;
            if (this.isBinary(data)) {
                // binary .stl
                var babylonMesh = new BABYLON.Mesh("stlmesh", scene);
                this.parseBinary(babylonMesh, data);
                if (meshes) {
                    meshes.push(babylonMesh);
                }
                return true;
            }
            // ASCII .stl
            // convert to string
            var array_buffer = new Uint8Array(data);
            var str = '';
            for (var i = 0; i < data.byteLength; i++) {
                str += String.fromCharCode(array_buffer[i]); // implicitly assumes little-endian
            }
            data = str;
            while (matches = this.solidPattern.exec(data)) {
                var meshName = matches[1];
                var meshNameFromEnd = matches[3];
                if (meshName != meshNameFromEnd) {
                    BABYLON.Tools.Error("Error in STL, solid name != endsolid name");
                    return false;
                }
                // check meshesNames
                if (meshesNames && meshName) {
                    if (meshesNames instanceof Array) {
                        if (!meshesNames.indexOf(meshName)) {
                            continue;
                        }
                    }
                    else {
                        if (meshName !== meshesNames) {
                            continue;
                        }
                    }
                }
                // stl mesh name can be empty as well
                meshName = meshName || "stlmesh";
                var babylonMesh = new BABYLON.Mesh(meshName, scene);
                this.parseASCII(babylonMesh, matches[2]);
                if (meshes) {
                    meshes.push(babylonMesh);
                }
            }
            return true;
        };
        STLFileLoader.prototype.load = function (scene, data, rootUrl) {
            var result = this.importMesh(null, scene, data, rootUrl, null, null, null);
            if (result) {
                scene.createDefaultCameraOrLight();
            }
            return result;
        };
        STLFileLoader.prototype.isBinary = function (data) {
            // check if file size is correct for binary stl
            var faceSize, nFaces, reader;
            reader = new DataView(data);
            faceSize = (32 / 8 * 3) + ((32 / 8 * 3) * 3) + (16 / 8);
            nFaces = reader.getUint32(80, true);
            if (80 + (32 / 8) + (nFaces * faceSize) === reader.byteLength) {
                return true;
            }
            // check characters higher than ASCII to confirm binary
            var fileLength = reader.byteLength;
            for (var index = 0; index < fileLength; index++) {
                if (reader.getUint8(index, false) > 127) {
                    return true;
                }
            }
            return false;
        };
        STLFileLoader.prototype.parseBinary = function (mesh, data) {
            var reader = new DataView(data);
            var faces = reader.getUint32(80, true);
            var dataOffset = 84;
            var faceLength = 12 * 4 + 2;
            var offset = 0;
            var positions = new Float32Array(faces * 3 * 3);
            var normals = new Float32Array(faces * 3 * 3);
            var indices = new Uint32Array(faces * 3);
            var indicesCount = 0;
            for (var face = 0; face < faces; face++) {
                var start = dataOffset + face * faceLength;
                var normalX = reader.getFloat32(start, true);
                var normalY = reader.getFloat32(start + 4, true);
                var normalZ = reader.getFloat32(start + 8, true);
                for (var i = 1; i <= 3; i++) {
                    var vertexstart = start + i * 12;
                    // ordering is intentional to match ascii import
                    positions[offset] = reader.getFloat32(vertexstart, true);
                    positions[offset + 2] = reader.getFloat32(vertexstart + 4, true);
                    positions[offset + 1] = reader.getFloat32(vertexstart + 8, true);
                    normals[offset] = normalX;
                    normals[offset + 2] = normalY;
                    normals[offset + 1] = normalZ;
                    offset += 3;
                }
                indices[indicesCount] = indicesCount++;
                indices[indicesCount] = indicesCount++;
                indices[indicesCount] = indicesCount++;
            }
            mesh.setVerticesData(BABYLON.VertexBuffer.PositionKind, positions);
            mesh.setVerticesData(BABYLON.VertexBuffer.NormalKind, normals);
            mesh.setIndices(indices);
            mesh.computeWorldMatrix(true);
        };
        STLFileLoader.prototype.parseASCII = function (mesh, solidData) {
            var positions = [];
            var normals = [];
            var indices = [];
            var indicesCount = 0;
            //load facets, ignoring loop as the standard doesn't define it can contain more than vertices
            var matches;
            while (matches = this.facetsPattern.exec(solidData)) {
                var facet = matches[1];
                //one normal per face
                var normalMatches = this.normalPattern.exec(facet);
                this.normalPattern.lastIndex = 0;
                if (!normalMatches) {
                    continue;
                }
                var normal = [Number(normalMatches[1]), Number(normalMatches[5]), Number(normalMatches[3])];
                var vertexMatch;
                while (vertexMatch = this.vertexPattern.exec(facet)) {
                    positions.push(Number(vertexMatch[1]), Number(vertexMatch[5]), Number(vertexMatch[3]));
                    normals.push(normal[0], normal[1], normal[2]);
                }
                indices.push(indicesCount++, indicesCount++, indicesCount++);
                this.vertexPattern.lastIndex = 0;
            }
            this.facetsPattern.lastIndex = 0;
            mesh.setVerticesData(BABYLON.VertexBuffer.PositionKind, positions);
            mesh.setVerticesData(BABYLON.VertexBuffer.NormalKind, normals);
            mesh.setIndices(indices);
            mesh.computeWorldMatrix(true);
        };
        return STLFileLoader;
    }());
    BABYLON.STLFileLoader = STLFileLoader;
    BABYLON.SceneLoader.RegisterPlugin(new STLFileLoader());
})(BABYLON || (BABYLON = {}));

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